Print The Porto

A collection of tips about 3d printing.

How to calibrate extrusion width

First make sure you've calibrated your e-steps.

Using a digital caliper, measure the thickness of your filament at 5 different points and get the average. You'll find most filament is not actually 1.75mm in width, but usually less. Enter the measured filament diameter in your slicer.

Download a 20mm calibration cube from

Using the cube load it into the slicer and set the following:

  • One, single perimeter (1 wall)
  • No infill
  • No top and bottom layer

You should get a print that looks like this:

Use your caliper and measure the top layers of the wall at several points to get an` average thickness. I got measurements around 1.07mm with my current extrusion multiplier of 1 and extrusion width set automatically to .96mm (120% of nozzle width) for my .8mm nozzle. Using the formula below, lets calibrate the extrusion.

Extrusion Formula
(desired thickness / measured thickness) * old extrusion multiplier = new extrusion multiplier

.96/1.07 * 1 = .89

I changed my extrusion multiplier to 0.89 and printed the model again. I still didn't get the correct thickness, so I repeated the process until, the magic number appeared.

Having the proper extrusion thickness should help with printing out correctly sized and properly extruded models. This is a process that might be needed on a per filament basis. Otherwise, just make sure to always measure your filament, prior to printing, otherwise it throws off all your hard work.

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